Ultrafast nonlinear optical responses of bismuth doped silicon-rich silica films

被引:7
作者
Imakita, Kenji [1 ]
Tsuchihashi, Yuya [1 ]
Naruiwa, Ryo [1 ]
Fujii, Minoru [1 ]
Sun, Hong-Tao [2 ]
Qiu, Jianrong [3 ]
Hayashi, Shinji [1 ]
机构
[1] Kobe Univ, Dept Elect & Elect Engn, Fac Engn, Nada Ku, Kobe, Hyogo 6578501, Japan
[2] Hokkaido Univ, Div Mat Sci & Engn, Fac Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[3] S China Univ Technol, Inst Opt Commun Mat, Guangzhou 510640, Guangdong, Peoples R China
关键词
bismuth; high-speed optical techniques; optical Kerr effect; optical materials; refractive index; silicon compounds; thin films; Z-SCAN; NANOCRYSTALS; FEMTOSECOND; ABSORPTION; GLASS;
D O I
10.1063/1.4766269
中图分类号
O59 [应用物理学];
学科分类号
摘要
Nonlinear optical responses of bismuth (Bi) doped silicon-rich silicon dioxide (Si-rich SiO2) films were studied by a z-scan and an optical Kerr gate method under femtosecond excitation around 800 nm. It was found that the Bi-doping enhances the nonlinear optical response of Si-rich SiO2 films by several orders of magnitudes. The nonlinear refractive index was of the order of 10(-11) cm(2)/W and the response time was shorter than our time resolution of 100 fs. The nonlinear refractive index was independent of the wavelength in the range from 750 to 835 nm, suggesting that virtual transitions are involved in the nonlinear optical processes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4766269]
引用
收藏
页数:4
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